These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Scrappy Level: The final level of the game, the submarine. For the entirety of the level's duration (up to and including the last boss), the level will slowly rock back and forth, causing both Zero and every barrel to slide left or right. The problem is that the movement isn't exact, and often has a slight up/down movement as well, though not always. It turns a level that requires a lot of precision platforming and quick reflexes into a bit of a Luck-Based Mission.